linux-kernel - Re: [tip: x86/mm] x86/mm/pat: Fix VM_PAT handling when fork() fails in copy_page

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Message-ID: <faa04276-a4d7-48af-8957-9123cc09f66b@redhat.com>
Date: Wed, 19 Mar 2025 11:27:19 +0100
From: David Hildenbrand <david@...hat.com>
To: Borislav Petkov <bp@...en8.de>
Cc: linux-kernel@...r.kernel.org, linux-tip-commits@...r.kernel.org,
 xingwei lee <xrivendell7@...il.com>, yuxin wang <wang1315768607@....com>,
 Marius Fleischer <fleischermarius@...il.com>, Ingo Molnar
 <mingo@...nel.org>, Andrew Morton <akpm@...ux-foundation.org>,
 Linus Torvalds <torvalds@...ux-foundation.org>,
 Dave Hansen <dave.hansen@...ux.intel.com>, Andy Lutomirski
 <luto@...nel.org>, Peter Zijlstra <peterz@...radead.org>,
 Rik van Riel <riel@...riel.com>, "H. Peter Anvin" <hpa@...or.com>,
 Peter Xu <peterx@...hat.com>, x86@...nel.org,
 Dan Carpenter <dan.carpenter@...aro.org>
Subject: Re: [tip: x86/mm] x86/mm/pat: Fix VM_PAT handling when fork() fails
 in copy_page_range()

On 19.03.25 11:24, Borislav Petkov wrote:
> On Wed, Mar 19, 2025 at 11:16:36AM +0100, David Hildenbrand wrote:
>> Ahh, the commit id is already supposed to be stable, got it.
> 
> Yap, we try to avoid rebasing when it becomes really hairy and the commits
> have been stable and out there for a while...
> 
>> I'm currently testing the following as fix, that avoids the second lookup
>> completely.
> 
> Cool, please holler asap what happens so that we can act accordingly.

Yes, expect it later today -- have to refresh my brain how I managed to 
reproduce the original issue.

-- 
Cheers,

David / dhildenb